In “Influenza” section of the encyclopedic reference book “Infectious Diseases”, etiology, epidemiology, pathogenesis, clinical manifestations, and diagnosis of influenza are considered. There are offered opportunities for treatment of influenza, including expediency of PulmoLOR® medicine use in adults and children from 6 years with aggravated allergic history in order to reduce duration of symptoms of acute respiratory viral infections and prevent a protracted course of disease is substantiated.